I've run into that as well. But for clarification are you making this registry changes on the virtual machine (the SBS2008 or 11 or whatever virtual instance) or are these registry settings for the host?

(I assumed on the virtual machine but you know what they say about assumptions...)

Aside from running these processes on the VM to adjust time settings(in my case a VM of SBS2011), what are process are you recommending to run on the actual host server? The Hyper-V R2 host we setup is a standalone (not part of any domain) as is the recommended setup. Are you findings showing that the following should be run on the host server to have it use an external pool for proper time as well (from your linked article):

Very helpful. However, my VMs are running Windows 2000 (part of the reason for virtualizing - to work on moving to a newer platform). Can you give the appropriate modifications for Win2K? Many of the w32tm commands given don't exist or have an equivalent. And it appears I have to restart the VM to get the changes applied, is this correct? Thanks.

Got me there. I am sorry, but other than test installing Win2K into Hyper-V and troubleshooting some issues with Win2K in Hyper-V on behalf of some others, I do not know off hand what the command set is.

Thank you very much for this write-up but I believe there is an error in the way the setting of the SpecialPollInterval for NTP is entered.

In Step 3 it is referenced as being as under HKLM\CurrentControlSet\services\W32Time\Config. Microsoft documents this proper place for this as belonging under ..TimeProviders\NtpClient (HKLM\SYSTEM\CurrentControlSet\Services\W32Time\TimeProviders\NtpClient\SpecialPollInterval) in KB816042.

If SpecialPollInterval is configured as outlined in Step 3 it does not appear to be used when the configuration is dumped with w32tm /query /configuration.

I also find myself questioning SpecialInterval value. It could just be me but I’m not finding that listed as a value by Microsoft. Can you point me to where this is documented?

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Our primary IT vertical is accounting firms since 1998. From accounting app support through to highly available solutions for accounting firms we've got it covered. I'm a Microsoft MVP since 2009. First on SBS and then starting in 2014 on Cluster.